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This uses a 300 LED Adafruit Neopixel strip driven by Sparkfun Spectrum Shield (make sure you buy the stackable headers with this) and Arduino Uno. The connections are fairly simple as shown in this pic. Apart from the ground and 5v you just need to connect one data pin to the Neopixel strip to control it (refer to Adafruit Neopixel Guide). There are two standard 1/8″ audio jacks on the Shield that you can connect input audio and pass through the other to your speaker.